I'd suggest cleaning the throttle body, especially behind the throttle plate and in the IAC air passages.
Test fuel pressure to verify that the pump and regulator maintain at least 36 PSIG with the engine idling. If the fuel pressure drops at throttle tip-in instead of increasing as it should, you might want to consider changing the fuel filter.
As a caution, the Multec injectors used in the early '90s are not very tolerant of astringent cleaners and harsh solvents, so curtail usage of those add-in fuel injector cleaners if at all possible. Running clean fuel through them and, if necessary, Techron cleaner in the proper concentration ONLY, is usually safe and can help if they are not completely clogged.
Inspect the vacuum lines and hoses, and test idle vacuum. Especially pay attention to the vacuum line to the transmission modulator (on the front of the trans). Getting a reading of idle vacuum might also help to identify problems.
Since the vehicle has 100,000 miles, it should be on its third transmission oil and filter change. However, since you cannot be certain how the vehicle was maintained, another change could be a good idea.